Also to alleviate migraines or sinus congestion

Stay hydrated.
Try to go to everything unscented (detergent, deodorant, make-up, soap, as much as you can find), no air fresheners or perfumes, the least powerful shampoo smell; put your car intake on ‘recycle’ and when air is clean, open windows; avoid strong inks, paints or chemical smells;
hire someone to vacuum dust, and run a Hepa air filter.
I also have a lot of house plants which increase oxygen;
I splash cold or warm water on my face to keep juices flowing, and spicy food.